US20080232732A1 - Roller bearing and outer ring manufacturing method - Google Patents
Roller bearing and outer ring manufacturing method Download PDFInfo
- Publication number
- US20080232732A1 US20080232732A1 US12/076,326 US7632608A US2008232732A1 US 20080232732 A1 US20080232732 A1 US 20080232732A1 US 7632608 A US7632608 A US 7632608A US 2008232732 A1 US2008232732 A1 US 2008232732A1
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- US
- United States
- Prior art keywords
- outer ring
- roller bearing
- step portion
- peripheral surface
- radially inwardly
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
- F16C19/44—Needle bearings
- F16C19/46—Needle bearings with one row or needles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/588—Races of sheet metal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/60—Raceways; Race rings divided or split, e.g. comprising two juxtaposed rings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/64—Special methods of manufacture
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2360/00—Engines or pumps
- F16C2360/18—Camshafts
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49636—Process for making bearing or component thereof
- Y10T29/49643—Rotary bearing
- Y10T29/49679—Anti-friction bearing or component thereof
- Y10T29/49693—Roller making
Definitions
- This invention relates to a roller bearing, and more particularly to a roller bearing suited for supporting a rotation shaft such as a camshaft and a crankshaft disposed in a housing of an engine, and further relates to an outer ring manufacturing method.
- roller bearings such as needle roller bearings are usually used for supporting a rotation shaft (such as a camshaft and a crankshaft) disposed in a housing (e.g. a cylinder block and a cylinder head) of an engine.
- a rotation shaft such as a camshaft and a crankshaft
- a housing e.g. a cylinder block and a cylinder head
- an inner ring can be omitted, and particularly in the case of the needle roller bearing, a small-diameter design (a small-size design) can be easily achieved while maintaining a loading capacity.
- the positioning of the outer ring in the axial direction can be effected by the engagement of the projections with the respective recesses.
- the projections and the recesses are relatively small in size, and particularly the projections formed on the outer ring do not have a sufficient strength, and therefore there are fears that the projections may undergo breakage, damage (bending), etc.
- roller bearing according to the present invention for supporting a rotation shaft disposed in a housing of an engine, the roller bearing comprising:
- a cylindrical outer ring that includes a raceway surface formed on an inner peripheral surface thereof and is disposed around the rotation shaft;
- the outer ring includes axial opposite end portions and a smaller-diameter portion that is disposed axially between the axial opposite end portions, is smaller in diameter than outer peripheral surfaces of the axial opposite end portions and has a predetermined width in an axial direction, and
- an outer peripheral surface of the small-diameter is retained by an outer ring fixing member fixed to the housing so that the outer ring is positioned in the axial direction and prevented from moving in the axial direction.
- the raceway surfaces are formed respectively at the inner peripheral surface of the outer ring and the outer peripheral surface of the rotation shaft, and with this construction in which the use of an inner ring is omitted, a small-diameter design (small-size design) can be achieved.
- the smaller-diameter portion is formed at the axially-central portion of the drawn cup-shaped outer ring, and therefore the outer ring can be positioned in the axial direction without providing any other special fixing means than the housing-side outer ring fixing member (e.g. a cap member), and the movement of the outer ring relative to the housing in the axial direction can be prevented.
- the housing engine body
- any design change for example, a knock pin and a pin receiving hole.
- the housing of the engine means a cylinder block or a cylinder head
- the rotation shaft means a camshaft or a crankshaft.
- the housing-side outer ring fixing member (fixed to the housing) includes a pedestal formed integrally on the housing and provided for the placing of the roller bearing (more specifically the outer ring) thereon, and a cap member fastened and fixed to the pedestal to clamp the roller bearing (more specifically, the outer ring) therebetween.
- the roller bearing can be applied to either of a crank journal and a crank pin.
- the roller bearing can be applied to an assembling-type camshaft having a detachable cam lobe. Therefore, the roller bearing may be of the type employing the split outer ring and the split cage (including a C-shaped split-type cage), in which case each of the outer ring and the cage is split in the circumferential direction) or may be of the type employing the one-piece outer ring and the one-piece cage, in which case each of the outer ring and the cage is not split in the circumferential direction.
- the outer ring is formed by pressing a metal sheet, and the outer peripheral surface and an inner peripheral surface of the outer ring are pressed radially inwardly into a step-like shape, and are radially inwardly bulged to form a step portion having an axis coinciding with an axis of the rotation shaft, the step portion defining the smaller-diameter portion.
- an inner peripheral surface of the step portion serves as the raceway surface of the outer ring, and a width of an outer peripheral surface of the step portion is substantially equal to a width of the outer ring fixing member fixed to said housing.
- the inner peripheral surface of the step portion is precisely maintained as the raceway surface, and by fitting the housing-side outer ring fixing member (for example, the cap member) on the outer peripheral surface of the step portion, the outer ring can be accurately positioned in the axial direction, so that the accuracy of mounting of the outer ring is enhanced.
- the step portion is symmetrical with respect to a central plane of the outer ring disposed perpendicular to the axis of the outer ring, and distal ends of the axial opposite end portions of the outer ring are bent radially inwardly to form a pair of opposed annular ribs, and the cage and the rollers are disposed within a space formed by the step portion and the pair of ribs.
- the rotation shaft for example, the crankshaft
- the roller bearing of the invention can be suitably mounted on the rotation shaft.
- the outer ring as well as the cage is split into two sections (that is, halves), and the two sections are combined into a cylindrical shape.
- the cage when the cage is made of a polymeric material (synthetic resin), the cage may be of the C-shaped split type in which case the cage is cut at a portion thereof in the circumferential direction to form a slit, and in this case the cage is elastically deformed to open or expand the slit, and in this condition the cage is detachably mounted on the rotation shaft through this expanded slit.
- the outer ring as well as the cage may be of the one-piece type such that they can not be split in the circumferential direction. Namely, when the cam lobe is detached from a shaft body, the one-piece outer ring and the one-piece cage which can not be split in the circumferential direction can be mounted on the camshaft.
- the roller bearing of the above construction is produced by a method comprising:
- the step portion is formed by pressing at the peripheral wall of the closed-bottom tubular outer ring-forming product formed by deep drawing (pressing), and thereafter the ribs are formed respectively at the bottom wall and the open end of the peripheral wall. Therefore, the outer ring of a small-diameter design (small-size design) having excellent dimensional accuracy can be produced. Accordingly, the accuracy of positioning of the outer ring in the axial direction can also be enhanced.
- a quenching step of applying a quenching treatment to the entire surface of the outer ring-forming product subjected to the step portion forming step there is effected a cage and rollers receiving step of receiving the cage and the rollers within the outer ring-forming product.
- a quenching step of applying a quenching treatment to the entire surface of the outer ring-forming product there is effected a splitting step of splitting the hardened outer ring-forming product into two sections (halves) in the circumferential direction by cutting or pressing.
- FIG. 1 is an exploded perspective view showing one example of a crankshaft provided with a roller bearing of the present invention.
- FIG. 2 is a front cross-sectional view of the roller bearing shown in FIG. 1 .
- FIG. 3 is a cross-sectional view taken along the line A-A of FIG. 2 .
- FIG. 4 is a flowchart showing a process for the production of an outer ring shown in FIG. 2 .
- FIG. 5 is an exploded perspective view showing one example of an assembling-type camshaft provided with a roller bearing of the invention.
- FIG. 6 is a front cross-sectional view of the roller bearing shown in FIG. 5 .
- FIG. 7 is a cross-sectional view taken along the line B-B of FIG. 6 .
- FIG. 8 is a flowchart showing a process for the production of an outer ring shown in FIG. 6 .
- FIG. 1 is an exploded perspective view showing one example of a crankshaft provided with a roller bearing of the present invention.
- a crank journal 71 of the crankshaft (rotation shaft) 70 is placed on a pedestal (outer ring fixing member) 105 formed integrally on a cylinder block (housing) 104 of an engine.
- a cap member (outer ring fixing member) 106 opposed to the pedestal 105 is fastened and fixed to the pedestal 105 to clamp the needle roller bearing (hereinafter referred to merely as “roller bearing”) 1 therebetween.
- the crankshaft 70 is supported on the cylinder block 104 by the roller bearing 1 .
- a pair of internally-threaded holes 105 h and 105 h are formed in the pedestal 105
- a pair of passage holes 106 h and 106 h are formed in the cap member 106 .
- a pair of bolts 107 and 107 are passed respectively through the passage holes 106 h and 106 h , and are threaded respectively into the internally-threaded holes 105 h and 105 h , thereby fixing the cap member 106 to the pedestal 105 .
- the pedestal 105 has a recess portion 105 a of a semi-cylindrical shape, while the cap member 106 has a recess portion 106 a of a semi-cylindrical shape, and when the cap member 106 is fixed to the pedestal 105 , with the two recess portions 105 a and 106 a combined together, the roller bearing 1 is retained within the combined two recess portions 105 a and 106 a .
- a pair of split-type outer ring members 2 and 3 jointly forming a split outer ring (hereinafter referred to merely as “outer ring) are fixed in an integral manner respectively to the cap member 106 and the pedestal 105 , and the crank journal 71 (the crankshaft 70 ) serving as an inner ring is connected to the outer ring members 2 and 3 so as to rotate relative thereto.
- the crankshaft 70 includes a crank pin 72 , a counter weight 73 , etc.
- FIG. 2 is a front cross-sectional view of the roller bearing
- FIG. 3 is a cross-sectional view taken along the line A-A of FIG. 2
- the roller bearing 1 comprises the pair of outer ring members (outer ring) 2 and 3 made of steel, a plurality of (for example, 6 ) needle rollers (hereinafter referred to merely as “rollers”) made of steel, and an annular C-shaped split-type cage (hereinafter referred to merely as “cage”) 5 made of a synthetic resin.
- the overall outer ring is divided or split into two sections (that is, the two outer ring members 2 and 3 ) in the circumferential direction, and the two outer ring members 2 and 3 are combined together into a cylindrical shape to form the outer ring having an axis coinciding with an axis O of the crank journal 71 .
- the rollers 4 are rollably disposed between an overall outer ring raceway surface (defined by raceway surfaces 2 a and 3 a formed respectively on inner peripheral surfaces of the outer ring members 2 and 3 ) and a journal raceway surface 71 a formed on an outer peripheral surface of the crank journal 71 .
- the cage 5 has pockets P formed therethrough and arranged at predetermined intervals (for example, at intervals of 60 degrees) in the circumferential direction, and the rollers 4 are received and held in the pockets P, respectively.
- the cage 5 is cut at a portion thereof in the circumferential direction to form a slit 5 a .
- the cage 5 is elastically deformed to open or expand the slit 5 a , and in this condition the cage 5 is detachably mounted on the crank journal 71 through this expanded slit 5 a.
- the outer ring ( 2 and 3 ) is formed by pressing a metal sheet into a drawn cup-shape (see FIG. 4 ).
- a step portion is formed at an outer peripheral portion of an axially-central portion of the outer ring, and is smaller in diameter than the outer peripheral surfaces of axial opposite end portions of the outer ring ( 2 and 3 ). More specifically, a pair of step portion sections 2 b and 3 b jointly forming the step portion are formed respectively in the outer peripheral surfaces of the two outer ring members 2 and 3 , respectively.
- the step portion ( 2 b and 3 b ) is continuously formed over the entire periphery of the outer ring ( 2 and 3 ), and has a predetermined width W 3 over its entire periphery.
- the outer peripheral surface and inner peripheral surface of the outer ring ( 2 and 3 ) are pressed radially inwardly into a step-like shape (see FIG. 4 ), and therefore are radially inwardly bulged to form the step portion ( 2 b and 3 b ) having an axis coinciding with the axis O.
- the cap member 106 and the pedestal 105 of the cylinder block 104 retain the outer peripheral surfaces of the step portion sections 2 b and 3 b , thereby positioning the outer ring ( 2 and 3 ) in the axial direction and also preventing the axial movement of the outer ring ( 2 and 3 ).
- the inner peripheral surfaces of the step portion sections 2 b and 3 b are formed into the outer ring raceway surfaces 2 a and 3 a , respectively, and the width W 3 of the outer peripheral surface of the step portion section 2 b , 3 b is equal to a width of the cap member 6 and a width of the pedestal 105 .
- the inner peripheral surfaces of the step portion sections 2 b and 3 b are highly precisely maintained as the outer ring raceway surfaces 2 a and 3 a , respectively, and the cap member 106 and the pedestal 105 are fitted respectively on the outer peripheral surfaces of the step portion sections 2 b and 3 b , and therefore the outer ring ( 2 and 3 ) can be accurately positioned in the axial direction, and the mounting accuracy of the outer ring ( 2 , 3 ) is enhanced.
- step portion section 2 b , 3 b is bilaterally symmetrical with respect to a central plane of the outer ring ( 2 and 3 ) (which is disposed centrally of the width thereof) disposed perpendicular to the axis O. Further, the distal ends of the axial opposite end portions of each outer ring member 2 , 3 are bent radially inwardly (toward the axis O) substantially perpendicularly to form a pair of opposed annular ribs 2 c and 2 c , 3 c and 3 c , respectively.
- the cage 5 and the rollers 4 are disposed within a space S formed by the step portion sections 2 b and 3 b , the pair of ribs 2 c and 2 c and the pair of ribs 3 c and 3 c , and therefore even when a thrust force acts on the crank journal 71 , the outer ring ( 2 and 3 ), the cage 5 and the rollers 4 can be retained in a stable manner.
- an overall width W 0 of each outer ring member 2 , 3 , a width W 1 of the cage 5 , a width W 2 of each outer ring raceway surface 2 a , 3 a and the width W 3 of the outer peripheral surface of each step portion section 2 b , 3 b are so set as to satisfy the following relation:
- a peripheral edge portion of a metal sheet M is firmly held or clamped between a die D and a wrinkle holder E, and in this condition the metal sheet M is pressed (deep drawn) by a punch P to provide an outer ring-forming product 20 of a closed-bottom tubular shape such that the peripheral edge portion of the deep drawn metal sheet M forms a deep-draw flange portion MF.
- a predetermined portion of a peripheral wall 20 a of the closed-bottom tubular outer ring-forming product 20 which has a width W 3 in the axial direction is pressed radially inwardly by a roller R.
- a step portion 20 b bulged radially inwardly into a step-like shape is formed at the peripheral wall 20 a , and has an axis coinciding with an axis O of the outer ring-forming product 20 .
- a through hole 20 d is formed axially through a bottom wall 20 c of the outer ring-forming product 20 having the step portion 20 b formed at the outer peripheral wall 20 a , and has an axis coinciding with the axis O.
- the remaining portion of the bottom wall 20 c forms a rib 20 e at one end of the outer ring-forming product 20 .
- the deep-draw flange portion MF formed at the open end of the peripheral wall 20 a of the outer ring-forming product 20 over the entire periphery thereof in the deep drawing step, is bent to extend radially inwardly to form a rib 20 f at the other end of the outer ring-forming product 20 .
- a quenching treatment is applied to an entire surface of the outer ring-forming product 20 .
- the outer ring-forming product 20 is split into two sections (i.e., halves) in the circumferential direction by a cutting operation employing a cutter.
- the step portion 20 b is formed by pressing at the peripheral wall 20 a of the closed-bottom tubular outer ring-forming product 20 formed by deep drawing (pressing) the metal sheet M, and thereafter the ribs 20 e and 20 f are formed respectively at the bottom wall 20 c and the open end of the peripheral wall 20 a .
- the outer ring ( 2 and 3 ) of a small-diameter design (small-size design) having excellent dimensional accuracy can be produced. Accordingly, the accuracy of positioning of the outer ring ( 2 and 3 ) in the axial direction can also be enhanced.
- FIG. 5 is an exploded perspective view showing one example of an assembling-type camshaft provided with a roller bearing of the invention.
- the assembling-type camshaft (rotation shaft) 60 has a cam lobe 62 which is detachably mounted onto the camshaft 60 in a direction of an axis thereof, and therefore a one-piece outer ring 21 and an one-piece cage 51 which can not be split in a circumferential direction can be used in the needle roller bearing (hereinafter referred to merely as “roller bearing”) 10 shown in FIG. 5 .
- a cam journal 61 of the assembling-type camshaft 60 is placed on a pedestal (outer ring fixing member) 101 formed integrally on a cylinder head (housing) 100 of an engine.
- a cap member (outer ring fixing member) 102 opposed to the pedestal 101 is fastened and fixed to the pedestal 101 to clamp the roller bearing 10 (which can be fitted onto the cam shaft 60 in the axial direction) therebetween.
- the assembling-type camshaft 60 is supported on the cylinder head 100 by the roller bearing 10 .
- a pair of internally-threaded holes 101 h and 101 h are formed in the pedestal 101
- a pair of passage holes 102 h and 102 h are formed in the cap member 102
- a pair of bolts 103 and 103 are passed respectively through the passage holes 102 h and 102 h , and are threaded respectively into the internally-threaded holes 101 h and 101 h , thereby fixing the cap member 102 to the pedestal 101 .
- the pedestal 101 has a recess portion 101 a of a semi-cylindrical shape
- the cap member 102 has a recess portion 102 a of a semi-cylindrical shape
- the roller bearing 10 is retained within the combined two recess portions 101 a and 102 a .
- the outer ring 21 is fixed in an integral manner to the pedestal 101 and the cap member 102
- the cam journal 61 (the assembling-type camshaft 60 ) serving as an inner ring is connected to the outer ring 21 so as to rotate relative thereto.
- FIG. 6 is a front cross-sectional view of the roller bearing
- FIG. 7 is a cross-sectional view taken along the line B-B of FIG. 6
- the roller bearing 10 comprises the outer ring 21 made of steel, a plurality of (for example, 6) needle rollers (hereinafter referred to merely as “rollers”) made of steel, and the annular cage (hereinafter referred to merely as “cage”) 51 made of a synthetic resin.
- the outer ring 21 of this embodiment corresponds to one formed by combining the two split-type outer ring members 2 and 3 into a one-piece construction.
- the cage 51 is a one-piece one corresponding to the C-shaped split-type cage 5 .
- the roller bearing of this second embodiment ( FIGS. 6 and 7 ) is identical in basic structure to the roller bearing of the first embodiment ( FIGS. 1 and 2 ), and therefore detailed description thereof is omitted here.
- a peripheral edge portion of a metal sheet M is firmly held or clamped between a die D and a wrinkle holder E, and in this condition the metal sheet M is pressed (deep drawn) by a punch P to provide an outer ring-forming product 20 of a closed-bottom tubular shape such that the peripheral edge portion of the deep drawn metal sheet M forms a deep-draw flange portion MF.
- a predetermined portion of a peripheral wall 20 a of the closed-bottom tubular outer ring-forming product 20 of the closed-bottom tubular shape which has a width W 3 in the axial direction is pressed radially inwardly by a roller R.
- a step portion 20 b bulged radially inwardly into a step-like shape is formed at the peripheral wall 20 a , and has an axis coinciding with an axis O of the outer ring-forming product 20 .
- a quenching treatment is applied to an entire surface of the outer ring-forming product 20 .
- Rollers 4 are held on a cage 51 , and then the cage 51 holding the rollers 4 are received within the outer ring-forming product 20 .
- a through hole 20 d is formed axially through a bottom wall 20 c of the outer ring-forming product 20 having the step portion 20 b formed at the outer peripheral wall 20 a , and has an axis coinciding with the axis O.
- the remaining portion of the bottom wall 20 c forms a rib 20 e at one end of the outer ring-forming product 20 .
- the deep-draw flange portion MF formed at the open end of the peripheral wall 20 a of the outer ring-forming product 20 over the entire periphery thereof in the deep drawing step, is bent to extend radially inwardly to form a rib 20 f at the other end of the outer ring-forming product 20 .
- the step portion 20 b is formed by pressing at the peripheral wall 20 a of the closed-bottom tubular shape outer ring-forming product 20 formed by deep drawing (pressing) the metal sheet M, and thereafter the ribs 20 e and 20 f are formed respectively at the bottom wall 20 c and the open end of the peripheral wall 20 a .
- the outer ring 21 of a small-diameter design (small-size design) having excellent dimensional accuracy can be produced. Accordingly, the accuracy of positioning of the outer ring 21 in the axial direction can also be enhanced.
- roller bearing 1 is used for the crank journal 71
- the roller bearing 1 can be used for the crank pin 72 .
- the roller bearing 10 is used for the assembling-type camshaft 60
- the roller bearing 1 of the first embodiment can be used for a camshaft having no detachable cam lobe 62 .
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Rolling Contact Bearings (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
- Mounting Of Bearings Or Others (AREA)
Abstract
A step portion is formed at an outer peripheral surface of an axially-central portion of an outer ring, and is smaller in diameter than outer peripheral surfaces of axial opposite end portions of the outer ring. The step portion is continuously formed over an entire periphery of the outer ring, and has a predetermined width over the entire periphery. The outer peripheral surface and inner peripheral surface of the outer ring are pressed radially inwardly, and therefore are bulged radially inwardly into a step-like shape to form the step portion having an axis coinciding with a axis of the outer ring. A pedestal of a cylinder block and a cap member retain the outer peripheral surface of the step portion, thereby positioning the outer ring in the axial direction and also preventing a movement of the outer ring in the axial direction.
Description
- This invention relates to a roller bearing, and more particularly to a roller bearing suited for supporting a rotation shaft such as a camshaft and a crankshaft disposed in a housing of an engine, and further relates to an outer ring manufacturing method.
- Recently, roller bearings such as needle roller bearings are usually used for supporting a rotation shaft (such as a camshaft and a crankshaft) disposed in a housing (e.g. a cylinder block and a cylinder head) of an engine. In such a case, when an outer peripheral surface of the rotation shaft is used directly as a raceway surface, the use of an inner ring can be omitted, and particularly in the case of the needle roller bearing, a small-diameter design (a small-size design) can be easily achieved while maintaining a loading capacity. However, such a roller bearing in which the use of the inner ring is omitted is not provided with fixing means for the rotation shaft, and therefore it is necessary to provide separate means for positioning an outer ring in an axial direction and for preventing an axial movement of the outer ring relative to the rotation shaft or the housing.
- Therefore, there has been proposed a technique in which projections formed on the outer peripheral surface of the outer ring are fitted in respective recesses formed in the housing side (a housing body or a cap member), thereby positioning the outer ring in the axial direction and also preventing the axial movement of the outer ring (see, for example, JP-A-2005-180459).
- In JP-A-2005-180459, the positioning of the outer ring in the axial direction can be effected by the engagement of the projections with the respective recesses. However, the projections and the recesses are relatively small in size, and particularly the projections formed on the outer ring do not have a sufficient strength, and therefore there are fears that the projections may undergo breakage, damage (bending), etc. Furthermore, it is necessary to form the recesses in the housing side, and the engine body requires additional processing and a design change, and this may increase the production cost.
- It is an object of this invention to provide a roller bearing in which a small-diameter design (small-size design) can be achieved by omitting the use of an inner ring, and also an outer ring can be positioned in an axial direction without providing special fixing means, and can be prevented from axial movement relative to a housing, and further provide a method of manufacturing an outer ring of the roller bearing.
- The above object has been achieved by a roller bearing according to the present invention for supporting a rotation shaft disposed in a housing of an engine, the roller bearing comprising:
- a cylindrical outer ring that includes a raceway surface formed on an inner peripheral surface thereof and is disposed around the rotation shaft;
- a plurality of rollers rollably disposed between the raceway surface of the outer ring and a raceway surface formed on an outer peripheral surface of the rotation shaft; and
- an annular cage that holds the plurality of rollers at predetermined intervals in a circumferential direction,
- wherein the outer ring includes axial opposite end portions and a smaller-diameter portion that is disposed axially between the axial opposite end portions, is smaller in diameter than outer peripheral surfaces of the axial opposite end portions and has a predetermined width in an axial direction, and
- wherein an outer peripheral surface of the small-diameter is retained by an outer ring fixing member fixed to the housing so that the outer ring is positioned in the axial direction and prevented from moving in the axial direction.
- Thus, the raceway surfaces are formed respectively at the inner peripheral surface of the outer ring and the outer peripheral surface of the rotation shaft, and with this construction in which the use of an inner ring is omitted, a small-diameter design (small-size design) can be achieved. The smaller-diameter portion is formed at the axially-central portion of the drawn cup-shaped outer ring, and therefore the outer ring can be positioned in the axial direction without providing any other special fixing means than the housing-side outer ring fixing member (e.g. a cap member), and the movement of the outer ring relative to the housing in the axial direction can be prevented. Particularly, the housing (engine body) does not require any additional processing and any design change (for example, a knock pin and a pin receiving hole).
- Incidentally, more specifically, “the housing of the engine” means a cylinder block or a cylinder head, and generally “the rotation shaft” means a camshaft or a crankshaft. Therefore, “the housing-side outer ring fixing member (fixed to the housing)” includes a pedestal formed integrally on the housing and provided for the placing of the roller bearing (more specifically the outer ring) thereon, and a cap member fastened and fixed to the pedestal to clamp the roller bearing (more specifically, the outer ring) therebetween.
- In the case of the crankshaft, the roller bearing can be applied to either of a crank journal and a crank pin. In the case of the camshaft, the roller bearing can be applied to an assembling-type camshaft having a detachable cam lobe. Therefore, the roller bearing may be of the type employing the split outer ring and the split cage (including a C-shaped split-type cage), in which case each of the outer ring and the cage is split in the circumferential direction) or may be of the type employing the one-piece outer ring and the one-piece cage, in which case each of the outer ring and the cage is not split in the circumferential direction.
- Preferably, the outer ring is formed by pressing a metal sheet, and the outer peripheral surface and an inner peripheral surface of the outer ring are pressed radially inwardly into a step-like shape, and are radially inwardly bulged to form a step portion having an axis coinciding with an axis of the rotation shaft, the step portion defining the smaller-diameter portion.
- More specifically, 3 an inner peripheral surface of the step portion serves as the raceway surface of the outer ring, and a width of an outer peripheral surface of the step portion is substantially equal to a width of the outer ring fixing member fixed to said housing. With this arrangement, the inner peripheral surface of the step portion is precisely maintained as the raceway surface, and by fitting the housing-side outer ring fixing member (for example, the cap member) on the outer peripheral surface of the step portion, the outer ring can be accurately positioned in the axial direction, so that the accuracy of mounting of the outer ring is enhanced.
- Preferably, the step portion is symmetrical with respect to a central plane of the outer ring disposed perpendicular to the axis of the outer ring, and distal ends of the axial opposite end portions of the outer ring are bent radially inwardly to form a pair of opposed annular ribs, and the cage and the rollers are disposed within a space formed by the step portion and the pair of ribs. With this arrangement, even when a thrust force acts on the rotation shaft (for example, the crankshaft), the outer ring, the cage and the rollers can be stably retained.
- In this case, the above space which is relatively large can be stably secured when an overall width (W0) of the outer ring, a width (W1) of the cage, a width W2 of the raceway surface and the width (W3) of the outer peripheral surface of the step portion are so set as to satisfy the following relation:
-
W0>W1>W2>W3 - Therefore, when the rotation shaft is, for example, a camshaft or a crankshaft, and the outer ring as well as the cage can be split in the circumferential direction, the roller bearing of the invention can be suitably mounted on the rotation shaft. Namely, the outer ring as well as the cage is split into two sections (that is, halves), and the two sections are combined into a cylindrical shape. However, when the cage is made of a polymeric material (synthetic resin), the cage may be of the C-shaped split type in which case the cage is cut at a portion thereof in the circumferential direction to form a slit, and in this case the cage is elastically deformed to open or expand the slit, and in this condition the cage is detachably mounted on the rotation shaft through this expanded slit.
- On the other hand, when the rotation shaft is an assembling-type camshaft having a detachable cam lobe, the outer ring as well as the cage may be of the one-piece type such that they can not be split in the circumferential direction. Namely, when the cam lobe is detached from a shaft body, the one-piece outer ring and the one-piece cage which can not be split in the circumferential direction can be mounted on the camshaft.
- Preferably, the roller bearing of the above construction is produced by a method comprising:
- a deep drawing step of deep drawing a metal sheet by pressing to form an outer ring-forming product of a closed-bottom tubular shape;
- a step portion-forming step of radially inwardly pressing a predetermined portion of a peripheral wall of the closed-bottom tubular outer ring-forming product which has a predetermined width in an axial direction to thereby form the step portion bulged radially inwardly into a step-like shape and having an axis coinciding with an axis of the outer ring-forming product;
- a first rib forming step of forming a through hole through that portion of a bottom wall of the outer ring-forming product (having the step portion formed thereat) which includes the axis, so that the remaining portion of the bottom wall forms the rib at one end of the outer ring; and
- a second rib forming step of bending a deep-draw flange portion (formed at the open end of the peripheral wall of the outer ring-forming product over the entire periphery thereof in the above deep drawing step) to form the rib at the other end of the outer ring.
- Thus, the step portion is formed by pressing at the peripheral wall of the closed-bottom tubular outer ring-forming product formed by deep drawing (pressing), and thereafter the ribs are formed respectively at the bottom wall and the open end of the peripheral wall. Therefore, the outer ring of a small-diameter design (small-size design) having excellent dimensional accuracy can be produced. Accordingly, the accuracy of positioning of the outer ring in the axial direction can also be enhanced.
- In the case of the one-piece outer ring, preferably, before the rib forming steps, there is effected a quenching step of applying a quenching treatment to the entire surface of the outer ring-forming product subjected to the step portion forming step, and further there is effected a cage and rollers receiving step of receiving the cage and the rollers within the outer ring-forming product. In the case of the split outer ring, after the rib forming steps, there is effected a quenching step of applying a quenching treatment to the entire surface of the outer ring-forming product, and further there is effected a splitting step of splitting the hardened outer ring-forming product into two sections (halves) in the circumferential direction by cutting or pressing.
-
FIG. 1 is an exploded perspective view showing one example of a crankshaft provided with a roller bearing of the present invention. -
FIG. 2 is a front cross-sectional view of the roller bearing shown inFIG. 1 . -
FIG. 3 is a cross-sectional view taken along the line A-A ofFIG. 2 . -
FIG. 4 is a flowchart showing a process for the production of an outer ring shown inFIG. 2 . -
FIG. 5 is an exploded perspective view showing one example of an assembling-type camshaft provided with a roller bearing of the invention. -
FIG. 6 is a front cross-sectional view of the roller bearing shown inFIG. 5 . -
FIG. 7 is a cross-sectional view taken along the line B-B ofFIG. 6 . -
FIG. 8 is a flowchart showing a process for the production of an outer ring shown inFIG. 6 . - A preferred embodiment of the present invention will now be described with reference to the drawings.
FIG. 1 is an exploded perspective view showing one example of a crankshaft provided with a roller bearing of the present invention. Acrank journal 71 of the crankshaft (rotation shaft) 70 is placed on a pedestal (outer ring fixing member) 105 formed integrally on a cylinder block (housing) 104 of an engine. A cap member (outer ring fixing member) 106 opposed to thepedestal 105 is fastened and fixed to thepedestal 105 to clamp the needle roller bearing (hereinafter referred to merely as “roller bearing”) 1 therebetween. Namely, thecrankshaft 70 is supported on thecylinder block 104 by the roller bearing 1. - More specifically, a pair of internally-threaded
holes pedestal 105, and a pair ofpassage holes cap member 106. A pair ofbolts passage holes holes cap member 106 to thepedestal 105. Thepedestal 105 has arecess portion 105 a of a semi-cylindrical shape, while thecap member 106 has arecess portion 106 a of a semi-cylindrical shape, and when thecap member 106 is fixed to thepedestal 105, with the tworecess portions recess portions outer ring members cap member 106 and thepedestal 105, and the crank journal 71 (the crankshaft 70) serving as an inner ring is connected to theouter ring members crankshaft 70 includes acrank pin 72, acounter weight 73, etc. -
FIG. 2 is a front cross-sectional view of the roller bearing, andFIG. 3 is a cross-sectional view taken along the line A-A ofFIG. 2 . As shown inFIGS. 2 and 3 , theroller bearing 1 comprises the pair of outer ring members (outer ring) 2 and 3 made of steel, a plurality of (for example, 6) needle rollers (hereinafter referred to merely as “rollers”) made of steel, and an annular C-shaped split-type cage (hereinafter referred to merely as “cage”) 5 made of a synthetic resin. The overall outer ring is divided or split into two sections (that is, the twoouter ring members 2 and 3) in the circumferential direction, and the twoouter ring members crank journal 71. Therollers 4 are rollably disposed between an overall outer ring raceway surface (defined byraceway surfaces outer ring members 2 and 3) and ajournal raceway surface 71 a formed on an outer peripheral surface of thecrank journal 71. Thecage 5 has pockets P formed therethrough and arranged at predetermined intervals (for example, at intervals of 60 degrees) in the circumferential direction, and therollers 4 are received and held in the pockets P, respectively. Thecage 5 is cut at a portion thereof in the circumferential direction to form aslit 5 a. Thecage 5 is elastically deformed to open or expand theslit 5 a, and in this condition thecage 5 is detachably mounted on thecrank journal 71 through this expanded slit 5 a. - The outer ring (2 and 3) is formed by pressing a metal sheet into a drawn cup-shape (see
FIG. 4 ). A step portion is formed at an outer peripheral portion of an axially-central portion of the outer ring, and is smaller in diameter than the outer peripheral surfaces of axial opposite end portions of the outer ring (2 and 3). More specifically, a pair ofstep portion sections outer ring members FIG. 4 ), and therefore are radially inwardly bulged to form the step portion (2 b and 3 b) having an axis coinciding with the axis O. - The
cap member 106 and thepedestal 105 of thecylinder block 104 retain the outer peripheral surfaces of thestep portion sections - More specifically, the inner peripheral surfaces of the
step portion sections ring raceway surfaces step portion section pedestal 105. Therefore, the inner peripheral surfaces of thestep portion sections ring raceway surfaces cap member 106 and thepedestal 105 are fitted respectively on the outer peripheral surfaces of thestep portion sections - Further, the
step portion section outer ring member annular ribs cage 5 and therollers 4 are disposed within a space S formed by thestep portion sections ribs ribs crank journal 71, the outer ring (2 and 3), thecage 5 and therollers 4 can be retained in a stable manner. - As shown in
FIG. 2 , an overall width W0 of eachouter ring member cage 5, a width W2 of each outerring raceway surface step portion section -
W0>W1>W2>W3 - Therefore, the space S which is relatively large can be stably secured.
- Next, a method of producing the outer ring (2 and 3) of the above construction will be briefly described with reference to
FIG. 4 . - (Deep Drawing Step)
- A peripheral edge portion of a metal sheet M is firmly held or clamped between a die D and a wrinkle holder E, and in this condition the metal sheet M is pressed (deep drawn) by a punch P to provide an outer ring-forming
product 20 of a closed-bottom tubular shape such that the peripheral edge portion of the deep drawn metal sheet M forms a deep-draw flange portion MF. - (Step Portion-Forming Step)
- A predetermined portion of a
peripheral wall 20 a of the closed-bottom tubular outer ring-formingproduct 20 which has a width W3 in the axial direction is pressed radially inwardly by a roller R. As a result, astep portion 20 b bulged radially inwardly into a step-like shape is formed at theperipheral wall 20 a, and has an axis coinciding with an axis O of the outer ring-formingproduct 20. - (Rib Forming Step)
- A through
hole 20 d is formed axially through abottom wall 20 c of the outer ring-formingproduct 20 having thestep portion 20 b formed at the outerperipheral wall 20 a, and has an axis coinciding with the axis O. As a result, the remaining portion of thebottom wall 20 c forms arib 20 e at one end of the outer ring-formingproduct 20. Also, the deep-draw flange portion MF, formed at the open end of theperipheral wall 20 a of the outer ring-formingproduct 20 over the entire periphery thereof in the deep drawing step, is bent to extend radially inwardly to form arib 20 f at the other end of the outer ring-formingproduct 20. - (Quenching Step)
- A quenching treatment is applied to an entire surface of the outer ring-forming
product 20. - (Splitting Step)
- After the quenching step, the outer ring-forming
product 20 is split into two sections (i.e., halves) in the circumferential direction by a cutting operation employing a cutter. - Thus, the
step portion 20 b is formed by pressing at theperipheral wall 20 a of the closed-bottom tubular outer ring-formingproduct 20 formed by deep drawing (pressing) the metal sheet M, and thereafter theribs bottom wall 20 c and the open end of theperipheral wall 20 a. As a result, the outer ring (2 and 3) of a small-diameter design (small-size design) having excellent dimensional accuracy can be produced. Accordingly, the accuracy of positioning of the outer ring (2 and 3) in the axial direction can also be enhanced. -
FIG. 5 is an exploded perspective view showing one example of an assembling-type camshaft provided with a roller bearing of the invention. The assembling-type camshaft (rotation shaft) 60 has acam lobe 62 which is detachably mounted onto thecamshaft 60 in a direction of an axis thereof, and therefore a one-pieceouter ring 21 and an one-piece cage 51 which can not be split in a circumferential direction can be used in the needle roller bearing (hereinafter referred to merely as “roller bearing”) 10 shown inFIG. 5 . - A
cam journal 61 of the assembling-type camshaft 60 is placed on a pedestal (outer ring fixing member) 101 formed integrally on a cylinder head (housing) 100 of an engine. A cap member (outer ring fixing member) 102 opposed to thepedestal 101 is fastened and fixed to thepedestal 101 to clamp the roller bearing 10 (which can be fitted onto thecam shaft 60 in the axial direction) therebetween. Namely, the assembling-type camshaft 60 is supported on thecylinder head 100 by theroller bearing 10. - More specifically, a pair of internally-threaded
holes pedestal 101, and a pair of passage holes 102 h and 102 h are formed in thecap member 102. A pair ofbolts holes cap member 102 to thepedestal 101. Thepedestal 101 has arecess portion 101 a of a semi-cylindrical shape, while thecap member 102 has arecess portion 102 a of a semi-cylindrical shape, and when thecap member 102 is fixed to thepedestal 101, with the tworecess portions roller bearing 10 is retained within the combined tworecess portions outer ring 21 is fixed in an integral manner to thepedestal 101 and thecap member 102, and the cam journal 61 (the assembling-type camshaft 60) serving as an inner ring is connected to theouter ring 21 so as to rotate relative thereto. -
FIG. 6 is a front cross-sectional view of the roller bearing, andFIG. 7 is a cross-sectional view taken along the line B-B ofFIG. 6 . As shown inFIGS. 6 and 7 , theroller bearing 10 comprises theouter ring 21 made of steel, a plurality of (for example, 6) needle rollers (hereinafter referred to merely as “rollers”) made of steel, and the annular cage (hereinafter referred to merely as “cage”) 51 made of a synthetic resin. Theouter ring 21 of this embodiment corresponds to one formed by combining the two split-typeouter ring members cage 51 is a one-piece one corresponding to the C-shaped split-type cage 5. Thus, the roller bearing of this second embodiment (FIGS. 6 and 7 ) is identical in basic structure to the roller bearing of the first embodiment (FIGS. 1 and 2 ), and therefore detailed description thereof is omitted here. - Next, a method of producing the
outer ring 21 will be briefly described with reference toFIG. 8 . - (Deep Drawing Step)
- A peripheral edge portion of a metal sheet M is firmly held or clamped between a die D and a wrinkle holder E, and in this condition the metal sheet M is pressed (deep drawn) by a punch P to provide an outer ring-forming
product 20 of a closed-bottom tubular shape such that the peripheral edge portion of the deep drawn metal sheet M forms a deep-draw flange portion MF. - (Step Portion-Forming Step)
- A predetermined portion of a
peripheral wall 20 a of the closed-bottom tubular outer ring-formingproduct 20 of the closed-bottom tubular shape which has a width W3 in the axial direction is pressed radially inwardly by a roller R. As a result, astep portion 20 b bulged radially inwardly into a step-like shape is formed at theperipheral wall 20 a, and has an axis coinciding with an axis O of the outer ring-formingproduct 20. - (Quenching Step)
- A quenching treatment is applied to an entire surface of the outer ring-forming
product 20. - (Cage and Rollers Receiving Step)
-
Rollers 4 are held on acage 51, and then thecage 51 holding therollers 4 are received within the outer ring-formingproduct 20. - (Rib Forming Step)
- A through
hole 20 d is formed axially through abottom wall 20 c of the outer ring-formingproduct 20 having thestep portion 20 b formed at the outerperipheral wall 20 a, and has an axis coinciding with the axis O. As a result, the remaining portion of thebottom wall 20 c forms arib 20 e at one end of the outer ring-formingproduct 20. Also, the deep-draw flange portion MF, formed at the open end of theperipheral wall 20 a of the outer ring-formingproduct 20 over the entire periphery thereof in the deep drawing step, is bent to extend radially inwardly to form arib 20 f at the other end of the outer ring-formingproduct 20. - Thus, the
step portion 20 b is formed by pressing at theperipheral wall 20 a of the closed-bottom tubular shape outer ring-formingproduct 20 formed by deep drawing (pressing) the metal sheet M, and thereafter theribs bottom wall 20 c and the open end of theperipheral wall 20 a. As a result, theouter ring 21 of a small-diameter design (small-size design) having excellent dimensional accuracy can be produced. Accordingly, the accuracy of positioning of theouter ring 21 in the axial direction can also be enhanced. - In the first embodiment, although the
roller bearing 1 is used for thecrank journal 71, theroller bearing 1 can be used for thecrank pin 72. In the second embodiment, although theroller bearing 10 is used for the assembling-type camshaft 60, theroller bearing 1 of the first embodiment can be used for a camshaft having nodetachable cam lobe 62.
Claims (5)
1. A roller bearing for supporting a rotation shaft disposed in a housing of an engine, the roller bearing comprising:
a cylindrical outer ring that includes a raceway surface formed on an inner peripheral surface thereof and is disposed around the rotation shaft;
a plurality of rollers rollably disposed between the raceway surface of the outer ring and a raceway surface formed on an outer peripheral surface of the rotation shaft; and
an annular cage that holds the plurality of rollers at predetermined intervals in a circumferential direction,
wherein the outer ring includes axial opposite end portions and a smaller-diameter portion that is disposed axially between the axial opposite end portions, is smaller in diameter than outer peripheral surfaces of the axial opposite end portions and has a predetermined width in an axial direction, and
wherein an outer peripheral surface of the small-diameter portion is retained by an outer ring fixing member fixed to the housing so that the outer ring is positioned in the axial direction and prevented from moving in the axial direction.
2. The roller bearing according to claim 1 , wherein
the outer ring is formed by pressing a metal sheet, and
the outer peripheral surface and an inner peripheral surface of the outer ring are pressed radially inwardly into a step-like shape, and are radially inwardly bulged to form a step portion having an axis coinciding with an axis of the rotation shaft, the step portion defining the smaller-diameter portion.
3. The roller bearing according to claim 2 , wherein
an inner peripheral surface of the step portion serves as the raceway surface of the outer ring, and
a width of an outer peripheral surface of the step portion is substantially equal to a width of the outer ring fixing member fixed to said housing.
4. The roller bearing according to claim 2 , wherein
the step portion is symmetrical with respect to a central plane of the outer ring disposed perpendicular to the axis of the outer ring,
distal ends of the axial opposite end portions of the outer ring are bent radially inwardly to form a pair of opposed annular ribs, and
the cage and the rollers are disposed within a space formed by the step portion and the pair of ribs.
5. A method of manufacturing an outer ring of a roller bearing, the method comprising:
deep drawing a metal sheet by pressing to form an outer ring-forming product having a closed-bottom tubular shape;
radially inwardly pressing a predetermined portion of a peripheral wall of the closed-bottom tubular outer ring-forming product which has a predetermined width in an axial direction to form a step portion bulged radially inwardly into a step-like shape and having an axis coinciding with an axis of the outer ring-forming product;
forming a through hole through a portion of a bottom wall of the outer ring-forming product, so that the remaining portion of the bottom wall forms a first rib at one end of the outer ring; and
bending an open end of a peripheral wall of the outer ring-forming product to form a second rib at the other end of the outer ring.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007073333A JP2008232278A (en) | 2007-03-20 | 2007-03-20 | Roller bearing |
JP2007-073333 | 2007-03-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20080232732A1 true US20080232732A1 (en) | 2008-09-25 |
Family
ID=39496074
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/076,326 Abandoned US20080232732A1 (en) | 2007-03-20 | 2008-03-17 | Roller bearing and outer ring manufacturing method |
Country Status (3)
Country | Link |
---|---|
US (1) | US20080232732A1 (en) |
EP (1) | EP1972803A1 (en) |
JP (1) | JP2008232278A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150337888A1 (en) * | 2012-08-31 | 2015-11-26 | Aktiebolaget Skf | Crankshaft assembly |
US20160069392A1 (en) * | 2014-09-10 | 2016-03-10 | Schaeffler Technologies AG & Co. KG | Radial bearing with variable lubrication flow restriction |
US9500229B2 (en) * | 2011-05-17 | 2016-11-22 | Aktiebolaget Skf | Cage for a toroidal roller bearing |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103410851B (en) * | 2013-08-26 | 2016-02-03 | 中国航空动力机械研究所 | A kind of needle bearing without inner ring |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2908782A1 (en) * | 1979-03-07 | 1980-09-18 | Stihl Maschf Andreas | Bush for connecting rod big end bearing - is retained by structure into which flange deformed section extends |
DE3321757A1 (en) * | 1982-06-19 | 1983-12-22 | INA Wälzlager Schaeffler KG, 8522 Herzogenaurach | Rolling bearing |
JP2005180459A (en) | 2003-11-27 | 2005-07-07 | Nsk Ltd | Roller bearing, manufacturing method of race plate and manufacturing method of retainer |
-
2007
- 2007-03-20 JP JP2007073333A patent/JP2008232278A/en active Pending
-
2008
- 2008-03-17 US US12/076,326 patent/US20080232732A1/en not_active Abandoned
- 2008-03-17 EP EP08004960A patent/EP1972803A1/en not_active Withdrawn
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9500229B2 (en) * | 2011-05-17 | 2016-11-22 | Aktiebolaget Skf | Cage for a toroidal roller bearing |
US20150337888A1 (en) * | 2012-08-31 | 2015-11-26 | Aktiebolaget Skf | Crankshaft assembly |
US9416817B2 (en) * | 2012-08-31 | 2016-08-16 | Aktiebolaget Skf | Crankshaft bearing assembly |
US20160069392A1 (en) * | 2014-09-10 | 2016-03-10 | Schaeffler Technologies AG & Co. KG | Radial bearing with variable lubrication flow restriction |
Also Published As
Publication number | Publication date |
---|---|
EP1972803A1 (en) | 2008-09-24 |
JP2008232278A (en) | 2008-10-02 |
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Owner name: JTEKT CORPORATION, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WASEDA, YOSHITAKA;REEL/FRAME:020712/0750 Effective date: 20080312 |
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